基于改进型滑模观测器的电动汽车用永磁同步电机转子位置估算

摘要

Permanent magnet synchronous motor(PMSM) as a driving motor directly affects the performance of electric vehicles.With account of advantages compared to traditional position sensors,sensorless detection of rotor position technology has became an important research direction.After considering the traditional sliding mode observer control principle,a modified sliding mode observer was proposed,which employed sigmoid function instead of saturation function to further improve the detection accuracy and continuity of a rotor and better weakened the "chattering".The mathematical model and Simulink simulation were established for the control system of PMSM sensorless detection based on a novel sliding mode observer.Compared with the common methods,the advantages of the new type of sliding mode observer were more intuitive,and the feasibility of the new control system was verified.%永磁同步电机(PMSM)作为一种电动汽车的驱动电机,对汽车性能有着直接的影响.目前,无位置传感器检测转子位置技术以其诸多优点代替了传统位置传感器,成为当今重要的科研方向之一.通过对传统滑模观测器控制原理的研究,提出了一种新型改进滑模观测器,即引入反曲函数代替饱和函数,进一步提高了无位置传感器检测的准确性、连续性,更好地削弱了“抖振”.基于新型滑模观测器的PMSM无位置传感器控制系统建立的数学模型及Simulink仿真,通过与常用的改进方法进行仿真比较,更直观地突出了新型滑模观测器的优势,验证了新型控制系统的可行性.